2.3.4. Pseudomonas Fluorescens

According to the primary count of about 2.74–2.89 log<sup>10</sup> CFU/g for *Pseudomonas fluorescens* (day 0) of the mackerel tuna fillet samples (Figure 6E), similar initial numeration (day 0) related to the rainbow trout was also found by other studies [44]. During the storage time, the *P*. *fluorescens* count rose to the final numeration of 12.03 log<sup>10</sup> CFU/g (control fillets), while the counts of XAN-EEP 0%, XAN-EEP 1%, and XAN-EEP 2% reached 9.55, 8.04, and 6.99 log<sup>10</sup> CFU/g at the last interval, being less than the control fillets. The *P. fluorescens* count in all groups was significantly (*p* < 0.05) less than the control, showing that EEP-containing treatments were the strongest concerning the inhibition treatments of *P*. *fluorescens*. The use of propolis extracts can be effective in inhibiting the activity of *P*. *aeruginosa* that causes chronic putrefaction as shown by studies conducted by Mohammadzadeh et al. [57], and De Marco et al. [58].
